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using SharpMap;
using SharpMap.Rendering;
using SharpMap.Utilities;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Reflection;
namespace NetTopologySuite.Geometries
{
/// <summary>
/// Set of extension methods for use of NetTopologySuite within SharpMap
/// </summary>
public static class NtsExtensions
{
/// <summary>
/// Gets the minimum coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The minimum coordinate</returns>
public static Coordinate Min(this Envelope self)
{
return new Coordinate(self.MinX, self.MinY);
}
/// <summary>
/// Ensures that a CoordinateSequence forms a valid ring,
/// returning a new closed sequence of the correct length if required.
/// If the input sequence is already a valid ring, it is returned
/// without modification.
/// If the input sequence is too short or is not closed,
/// it is extended with one or more copies of the start point.
/// </summary>
/// <param name="fact">The CoordinateSequenceFactory to use to create the new sequence</param>
/// <param name="seq">The sequence to test</param>
/// <returns>The original sequence, if it was a valid ring, or a new sequence which is valid.</returns>
public static CoordinateSequence EnsureValidRing(CoordinateSequenceFactory fact, CoordinateSequence seq)
{
var n = seq.Count;
// empty sequence is valid
if (n == 0) return seq;
// too short - make a new one
if (n <= 3)
return CreateClosedRing(fact, seq, 4);
var isClosed = Math.Abs(seq.GetOrdinate(0, Ordinate.X) - seq.GetOrdinate(n - 1, Ordinate.X)) < double.Epsilon &&
Math.Abs(seq.GetOrdinate(0, Ordinate.Y) - seq.GetOrdinate(n - 1, Ordinate.Y)) < double.Epsilon;
if (isClosed) return seq;
// make a new closed ring
return CreateClosedRing(fact, seq, n + 1);
}
private static CoordinateSequence CreateClosedRing(CoordinateSequenceFactory fact, CoordinateSequence seq, int size)
{
var newseq = fact.Create(size, seq.Dimension);
int n = seq.Count;
Copy(seq, 0, newseq, 0, n);
// fill remaining coordinates with start point
for (int i = n; i < size; i++)
Copy(seq, 0, newseq, i, 1);
return newseq;
}
///<summary>
/// Copies a section of a <see cref="CoordinateSequence"/> to another <see cref="CoordinateSequence"/>.
/// The sequences may have different dimensions;
/// in this case only the common dimensions are copied.
///</summary>
/// <param name="src">The sequence to copy coordinates from</param>
/// <param name="srcPos">The starting index of the coordinates to copy</param>
/// <param name="dest">The sequence to which the coordinates should be copied to</param>
/// <param name="destPos">The starting index of the coordinates in <see paramref="dest"/></param>
/// <param name="length">The number of coordinates to copy</param>
public static void Copy(CoordinateSequence src, int srcPos, CoordinateSequence dest, int destPos, int length)
{
for (int i = 0; i < length; i++)
CopyCoord(src, srcPos + i, dest, destPos + i);
}
///<summary>
/// Copies a coordinate of a <see cref="CoordinateSequence"/> to another <see cref="CoordinateSequence"/>.
/// The sequences may have different dimensions;
/// in this case only the common dimensions are copied.
///</summary>
/// <param name="src">The sequence to copy coordinate from</param>
/// <param name="srcPos">The index of the coordinate to copy</param>
/// <param name="dest">The sequence to which the coordinate should be copied to</param>
/// <param name="destPos">The index of the coordinate in <see paramref="dest"/></param>
public static void CopyCoord(CoordinateSequence src, int srcPos, CoordinateSequence dest, int destPos)
{
int minDim = Math.Min(src.Dimension, dest.Dimension);
for (int dim = 0; dim < minDim; dim++)
{
var ordinate = (Ordinate)dim;
double value = src.GetOrdinate(srcPos, ordinate);
dest.SetOrdinate(destPos, ordinate, value);
}
}
/// <summary>
/// Ensures that a CoordinateSequence forms a valid ring,
/// returning a new closed sequence of the correct length if required.
/// If the input sequence is already a valid ring, it is returned
/// without modification.
/// If the input sequence is too short or is not closed,
/// it is extended with one or more copies of the start point.
/// </summary>
/// <param name="coordinates">List of coordinates</param>
/// <returns>The original sequence, if it was a valid ring, or a new sequence which is valid.</returns>
public static void EnsureValidRing(this List<Coordinate> coordinates)
{
var seq = NetTopologySuite.NtsGeometryServices.Instance.DefaultCoordinateSequenceFactory.Create(coordinates.ToArray());
seq = EnsureValidRing(NetTopologySuite.NtsGeometryServices.Instance.DefaultCoordinateSequenceFactory, seq);
if (seq.Count != coordinates.Count)
{
for (int i = coordinates.Count; i < seq.Count; i++)
{
coordinates.Add(seq.GetCoordinate(i));
}
}
}
/// <summary>
/// Gets the maximum coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The maximum coordinate</returns>
public static Coordinate Max(this Envelope self)
{
return new Coordinate(self.MaxX, self.MaxY);
}
/// <summary>
/// Adds to coordinate's
/// </summary>
/// <param name="self">the first coordinate</param>
/// <param name="summand">The second coordinate</param>
public static Coordinate Add(this Coordinate self, Coordinate summand)
{
if (self == null && summand == null)
return null;
if (summand == null)
return self;
if (self == null)
return summand;
// for now we only care for 2D
return new Coordinate(self.X + summand.X, self.Y + summand.Y);
}
/// <summary>
/// Subtracts two coordinates from one another
/// </summary>
/// <param name="self">The first coordinate</param>
/// <param name="summand">The second coordinate</param>
public static Coordinate Subtract(this Coordinate self, Coordinate summand)
{
if (self == null && summand == null)
return null;
if (summand == null)
return self;
if (self == null)
return new Coordinate(-summand.X, -summand.Y);
// for now we only care for 2D
return new Coordinate(self.X - summand.X, self.Y - summand.Y);
}
/// <summary>
/// Gets the axis of the longest axis
/// </summary>
/// <param name="self"></param>
/// <returns></returns>
public static Ordinate LongestAxis(this Envelope self)
{
if (self.MaxExtent == self.Width)
return Ordinate.X;
return Ordinate.Y;
}
/// <summary>
/// Gets the bottom-left coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The bottom-left coordinate</returns>
public static Coordinate BottomLeft(this Envelope self)
{
return self.Min();
}
/// <summary>
/// Gets the bottom-right coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The bottom-right coordinate</returns>
public static Coordinate BottomRight(this Envelope self)
{
return new Coordinate(self.MaxX, self.MinY);
}
/// <summary>
/// Gets the top-left coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The top-left coordinate</returns>
public static Coordinate TopLeft(this Envelope self)
{
return new Coordinate(self.MinX, self.MaxY);
}
/// <summary>
/// Gets the top-right coordinate of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The top-right coordinate</returns>
public static Coordinate TopRight(this Envelope self)
{
return self.Max();
}
/// <summary>
/// Gets the minimum y-value of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The minimum y-value</returns>
public static double Bottom(this Envelope self)
{
return self.MinY;
}
/// <summary>
/// Gets the maximum y-value of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The maximum y-value</returns>
public static double Top(this Envelope self)
{
return self.MaxY;
}
/// <summary>
/// Gets the minimum x-value of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The minimum x-value</returns>
public static double Left(this Envelope self)
{
return self.MinX;
}
/// <summary>
/// Gets the maximum x-value of the <see cref="Envelope"/>
/// </summary>
/// <param name="self">The envelope</param>
/// <returns>The maximum x-value</returns>
public static double Right(this Envelope self)
{
return self.MaxX;
}
/// <summary>
/// Transforms a <see cref="LineString"/> to an array of <see cref="PointF"/>s.
/// </summary>
/// <param name="self">The linestring</param>
/// <param name="map">The mapviewport defining transformation parameters</param>
/// <returns>The array of <see cref="PointF"/>s</returns>
public static PointF[] TransformToImage(this LineString self, MapViewport map)
{
if (map.MapTransformRotation.Equals(0f))
return Transform.WorldToMap(self.Coordinates, map.Left, map.Top, map.PixelWidth, map.PixelHeight);
return Transform.WorldToMap(self.Coordinates, map.WorldToMapTransform(false));
}
/// <summary>
/// Converts a <see cref="Coordinate"/> to an array of <see cref="double"/>s.
/// </summary>
/// <param name="self">The coordinate</param>
/// <returns>An array of doubles</returns>
public static double[] ToDoubleArray(this Coordinate self)
{
return new[] { self.X, self.Y /*, self.Z */};
}
/// <summary>
/// Abbreviation to counter clockwise function
/// </summary>
/// <param name="self">The ring</param>
/// <returns><c>true</c> if the ring is oriented counter clockwise</returns>
public static bool IsCCW(this LinearRing self)
{
return NetTopologySuite.Algorithm.Orientation.IsCCW(self.Coordinates);
}
/// <summary>
/// Increases the size of the boundingbox by the given amount in all directions
/// </summary>
/// <param name="self">The envelope to grow</param>
/// <param name="amount">Amount to grow in all directions</param>
public static Envelope Grow(this Envelope self, double amount)
{
return new Envelope(self.MinX - amount, self.MaxX + amount,
self.MinY - amount, self.MaxY + amount);
}
/// <summary>
/// Increases the size of the boundingbox by the given amount in horizontal and vertical directions
/// </summary>
/// <param name="self">The envelope</param>
/// <param name="amountInX">Amount to grow in horizontal direction</param>
/// <param name="amountInY">Amount to grow in vertical direction</param>
public static Envelope Grow(this Envelope self, double amountInX, double amountInY)
{
return new Envelope(self.MinX - amountInX, self.MaxX + amountInX,
self.MinY - amountInY, self.MaxY + amountInY);
}
/// <summary>
/// Transforms a <see cref="Polygon"/> to an array of <see cref="PointF"/>s
/// </summary>
/// <param name="self">The polygon</param>
/// <param name="map">The map that defines the affine coordinate transformation.</param>
/// <param name="useClipping">Use clipping for the polygon</param>
/// <returns>An array of PointFs</returns>
public static GraphicsPath TransformToImage(this Polygon self, MapViewport map, bool useClipping = false)
{
var res = new GraphicsPath(FillMode.Alternate);
if (useClipping)
{
res.AddPolygon(VectorRenderer.ClipPolygon(
VectorRenderer.LimitValues(self.ExteriorRing.TransformToImage(map), VectorRenderer.ExtremeValueLimit),
map.Size.Width, map.Size.Height));
for (var i = 0; i < self.NumInteriorRings; i++)
res.AddPolygon(VectorRenderer.ClipPolygon(
VectorRenderer.LimitValues(self.GetInteriorRingN(i).TransformToImage(map), VectorRenderer.ExtremeValueLimit),
map.Size.Width, map.Size.Height));
}
else
{
res.AddPolygon(self.ExteriorRing.TransformToImage(map));
for (var i = 0; i < self.NumInteriorRings; i++)
res.AddPolygon(self.GetInteriorRingN(i).TransformToImage(map));
}
return res;
}
/// <summary>
/// Tests if a coordinate is empty
/// </summary>
/// <param name="c">The coordinate</param>
public static bool IsEmpty(this Coordinate c)
{
if (c == null) return true;
if (!double.IsNaN(c.X)) return false;
if (!double.IsNaN(c.Y)) return false;
return true;
}
/// <summary>
///
/// </summary>
/// <param name="self"></param>
/// <param name="wkt"></param>
/// <returns></returns>
public static Geometry GeomFromText(this Geometry self, string wkt)
{
var factory = self == null ? new NetTopologySuite.Geometries.GeometryFactory() : self.Factory;
var reader = new NetTopologySuite.IO.WKTReader(factory);
return reader.Read(wkt);
}
private static readonly FieldInfo _envFi;
static NtsExtensions()
{
try
{
_envFi = typeof(Geometry).GetField("_envelope", BindingFlags.Instance | BindingFlags.NonPublic);
}
catch { }
}
/// <summary>
/// Utility function to set the <see cref="Geometry.EnvelopeInternal"/> when it is known.
/// </summary>
/// <param name="geom">The geometry</param>
/// <param name="envelope">The envelope of <paramref name="geom"/></param>.
public static void SetExtent(Geometry geom, Envelope envelope)
{
if (geom == null)
return;
if (_envFi != null)
_envFi.SetValue(geom, envelope);
}
}
}
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